31 August 1944:
At 1300 an airraid warning is received and the ships turn around and head north to Hachijo Jima. The escorts outstrip the merchantmen that are left behind.

1 September 1944:
Early that morning INA MARU is torpedoed east of Sumisu Jima and sunk by LtCdr Robert H. Close’s (USNA ’34) USS PILOTFISH (SS-386). At about 0900 SHIBAZONO MARU is unsuccessfully attacked also by USS PILOTFISH, the ship avoids the attack and at 1300 arrives at Hachijo Jima where the ship anchors. The escorts are called back to meet the ships but are unable to contact INA MARU that has disappeared with the loss of 30 crew.

17 September 1944:
At 0425, auxiliary submarine chaser TAKUNAN MARU No. 6 suffers an engine failure and starts to drift.
At 0700, kaibokan AMAKUSA departs Tateyama to assist and subsequently tow TAKUNAN MARU No. 6 which is a drift at position bearing 120 degrees 20 miles off Mikurajima.
At 0745, at position bearing 37 degrees 3 miles off Miyakejima CH-44 meets up with TAKUNAN MARU No. 6. Shortly after CH-44 returns to convoy No. 4913.
At 1015, at position bearing 140 degrees 3 miles off Oshima AMAKUSA meets up with TAKANAN MARU No. 6. TAKUNAN MARU No. 6 meanwhile has managed to repair her engine failure and can navigate on her own again.
At 1700, AMAKUSA arrives with TAKUNAN MARU No. 6 at Yokosuka outer harbor. The convoy arrives at Yokosuka at an unknown time.

11 November 1944:
N of Hachijo Island. A patrol bomber from the 901st NAG spots a submarine in that area, attacks it with depth charges and then conducts CD-4 to the scene of attack. An oil slick is sighted and soon a sonar contact is made from a distance of 3,300 yds.
LtCdr John G. Hollingsworth's (USNA ’31) USS SCAMP (SS-277) attempts to attack the approaching escort, firing a divergent spread of three torpedoes from a distance of 1,100 yds. LtCdr Mizutani evades all of them and conducts three depth charge attacks. After a total of 70 depth charges have been expended, several giant air bubbles and large quantities of oil are sighted on the surface.
USS SCAMP is lost with all 83 hands at 33-38N, 141-00E.

S of Yome Jima, Bonins. After 2110, the convoy is attacked by a single Boeing B-29 "Superfortress". During the brief encounter one sailor from CD-4 is lost in the dark, probably washed overboard during an evasive manoeuvre.

30 January 1945:
Off Mikura Island. At 0735, Cdr. John J. Foote's USS THREADFIN (SS-410) torpedoes and sinks the 1,864-ton ISSEI MARU in 33-30N, 135-34E. The submarine is spotted by a Nakajima B5N2 "Kate" torpedo bomber from the 903rd NAG, who alerts the passing convoy. CD-4 is detached to the scene of attack. She conducts a depth-charge attack, forcing the submarine to the depth of 462 ft.

1 February 1945:
Arrives at Tateyama.

April 1945:
Reassigned to the 4th Special Attack Unit. Patrols between Daio Zaki and Shimizu.

6-15 May 1945:
At sea off Ise Wan patrolling and escorting convoys.

20-23 May 1945:
Undertakes a patrol off Ise Wan area.

28 May 1945:
Departs Ise Wan area on patrol.

15 August 1945: End of Hostilities:
At Yokosuka.

September 1945:
Yokosuka. Surrendered to Allied Occupation Forces. CH-44’s hull and machinery are in such bad condition that her use of as a repatriatrion vessel is deemed impossible. She is laid up at Yokosuka. [1]

15 September 1945:
Removed from the Navy List.

1948:
Scrapped.

Authors' Note:
[1] Another Japanese source says CH-44 was surrendered at Yokohama. Still another source claims she was laid up at Uraga Dock Co., Tokyo.
Thanks to Mr. Gilbert Casse of France and Mr. Berend van der Wal of Netherlands.